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k in (-oo:+oo)
7-((3*k)/4) = 2 // - 2
7-((3*k)/4)-2 = 0
(-3/4)*k-2+7 = 0
5-3/4*k = 0 // - 5
-3/4*k = -5 // : -3/4
k = -5/(-3/4)
k = 20/3
k = 20/3
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